[neaden]

If life independently started in two places in our solar system in fairly different places, then it would be reasonable to think that it is fairly common and we would expect it in most solar systems. If life only exists on Earth in our solar system, then it's more reasonable to think life is fairly rare.

[zardo]

Also no possible, there's life on Europa and it shares a common ancestor with life on Earth.

https://www.technologyreview.com/2011/08/22/22081/earth-ejec...